Clay minerals in Cenozoic sediments off Cape Roberts (McMurdo Sound, Antarctica) reveal the palaeoclimatic history
The clay mineral assemblages of the ca. 1600 m thick Cenozoic sedimentary succession recovered at the CRP-1, CRP-2/2A and CRP-3 drill sites off Cape Roberts on the McMurdo Sound shelf, Antarctica, were analysed in order to reconstruct the palaeoclimate and the glacial history of this part of Antarct...
Published in: | Palaeogeography, Palaeoclimatology, Palaeoecology |
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Online Access: | http://hdl.handle.net/11571/133009 https://doi.org/10.1016/j.palaeo.2005.06.022 |
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ftunivpavia:oai:iris.unipv.it:11571/133009 2024-02-27T08:35:18+00:00 Clay minerals in Cenozoic sediments off Cape Roberts (McMurdo Sound, Antarctica) reveal the palaeoclimatic history Ehermann W. SETTI, MASSIMO MARINONI, LUIGI TITO Ehermann, W. Setti, Massimo Marinoni, LUIGI TITO 2005 STAMPA http://hdl.handle.net/11571/133009 https://doi.org/10.1016/j.palaeo.2005.06.022 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000234606200002 volume:229 issue:3 firstpage:187 lastpage:211 numberofpages:25 journal:PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY http://hdl.handle.net/11571/133009 doi:10.1016/j.palaeo.2005.06.022 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-28444456415 ANTARCTICA CENOZOIC CLAY MINERALS PALAEOCLIMATE CAPE ROBERTS PROJECT info:eu-repo/semantics/article 2005 ftunivpavia https://doi.org/10.1016/j.palaeo.2005.06.022 2024-01-31T17:51:11Z The clay mineral assemblages of the ca. 1600 m thick Cenozoic sedimentary succession recovered at the CRP-1, CRP-2/2A and CRP-3 drill sites off Cape Roberts on the McMurdo Sound shelf, Antarctica, were analysed in order to reconstruct the palaeoclimate and the glacial history of this part of Antarctica. The sequence can be subdivided into seven clay mineral units that reflect the transition from humid to subpolar and polar conditions. Unit I (35–33.6 Ma) is characterised by an almost monomineralic assemblage consisting of well crystalline, authigenic smectite, and therefore does not allow a palaeoclimatic reconstruction. Unit II (33.6–33.1 Ma) has also a monomineralic clay mineral composition. However, the assemblage consists of variably crystallized smectite that, at least in part, is of detrital origin and indicates chemical weathering under a humid climate. The main source area for the clays was in the Transantarctic Mountains. Minor amounts of illite and chlorite appear for the first time in Unit III (33.1–31 Ma) and suggest subordinate physical weathering. The sediments of Unit IV (31–30.5 Ma) have strongly variable smectite and illite concentrations indicating an alternation of chemical weathering periods and physical weathering periods. Unit V (30.5–24.2 Ma) shows a further shift towards physical weathering. Unit VI (24.2–18.5 Ma) indicates strong physical weathering under a cold climate with persistent and intense illite formation. Unit VII (18.5 Ma to present) documents an additional input of smectite derived from the McMurdo Volcanic Group in the south. Article in Journal/Newspaper Antarc* Antarctica McMurdo Sound IRIS UNIPV (Università degli studi di Pavia) Cape Roberts ENVELOPE(-70.467,-70.467,-68.950,-68.950) McMurdo Sound Transantarctic Mountains Palaeogeography, Palaeoclimatology, Palaeoecology 229 3 187 211 |
institution |
Open Polar |
collection |
IRIS UNIPV (Università degli studi di Pavia) |
op_collection_id |
ftunivpavia |
language |
English |
topic |
ANTARCTICA CENOZOIC CLAY MINERALS PALAEOCLIMATE CAPE ROBERTS PROJECT |
spellingShingle |
ANTARCTICA CENOZOIC CLAY MINERALS PALAEOCLIMATE CAPE ROBERTS PROJECT Ehermann W. SETTI, MASSIMO MARINONI, LUIGI TITO Clay minerals in Cenozoic sediments off Cape Roberts (McMurdo Sound, Antarctica) reveal the palaeoclimatic history |
topic_facet |
ANTARCTICA CENOZOIC CLAY MINERALS PALAEOCLIMATE CAPE ROBERTS PROJECT |
description |
The clay mineral assemblages of the ca. 1600 m thick Cenozoic sedimentary succession recovered at the CRP-1, CRP-2/2A and CRP-3 drill sites off Cape Roberts on the McMurdo Sound shelf, Antarctica, were analysed in order to reconstruct the palaeoclimate and the glacial history of this part of Antarctica. The sequence can be subdivided into seven clay mineral units that reflect the transition from humid to subpolar and polar conditions. Unit I (35–33.6 Ma) is characterised by an almost monomineralic assemblage consisting of well crystalline, authigenic smectite, and therefore does not allow a palaeoclimatic reconstruction. Unit II (33.6–33.1 Ma) has also a monomineralic clay mineral composition. However, the assemblage consists of variably crystallized smectite that, at least in part, is of detrital origin and indicates chemical weathering under a humid climate. The main source area for the clays was in the Transantarctic Mountains. Minor amounts of illite and chlorite appear for the first time in Unit III (33.1–31 Ma) and suggest subordinate physical weathering. The sediments of Unit IV (31–30.5 Ma) have strongly variable smectite and illite concentrations indicating an alternation of chemical weathering periods and physical weathering periods. Unit V (30.5–24.2 Ma) shows a further shift towards physical weathering. Unit VI (24.2–18.5 Ma) indicates strong physical weathering under a cold climate with persistent and intense illite formation. Unit VII (18.5 Ma to present) documents an additional input of smectite derived from the McMurdo Volcanic Group in the south. |
author2 |
Ehermann, W. Setti, Massimo Marinoni, LUIGI TITO |
format |
Article in Journal/Newspaper |
author |
Ehermann W. SETTI, MASSIMO MARINONI, LUIGI TITO |
author_facet |
Ehermann W. SETTI, MASSIMO MARINONI, LUIGI TITO |
author_sort |
Ehermann W. |
title |
Clay minerals in Cenozoic sediments off Cape Roberts (McMurdo Sound, Antarctica) reveal the palaeoclimatic history |
title_short |
Clay minerals in Cenozoic sediments off Cape Roberts (McMurdo Sound, Antarctica) reveal the palaeoclimatic history |
title_full |
Clay minerals in Cenozoic sediments off Cape Roberts (McMurdo Sound, Antarctica) reveal the palaeoclimatic history |
title_fullStr |
Clay minerals in Cenozoic sediments off Cape Roberts (McMurdo Sound, Antarctica) reveal the palaeoclimatic history |
title_full_unstemmed |
Clay minerals in Cenozoic sediments off Cape Roberts (McMurdo Sound, Antarctica) reveal the palaeoclimatic history |
title_sort |
clay minerals in cenozoic sediments off cape roberts (mcmurdo sound, antarctica) reveal the palaeoclimatic history |
publishDate |
2005 |
url |
http://hdl.handle.net/11571/133009 https://doi.org/10.1016/j.palaeo.2005.06.022 |
long_lat |
ENVELOPE(-70.467,-70.467,-68.950,-68.950) |
geographic |
Cape Roberts McMurdo Sound Transantarctic Mountains |
geographic_facet |
Cape Roberts McMurdo Sound Transantarctic Mountains |
genre |
Antarc* Antarctica McMurdo Sound |
genre_facet |
Antarc* Antarctica McMurdo Sound |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000234606200002 volume:229 issue:3 firstpage:187 lastpage:211 numberofpages:25 journal:PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY http://hdl.handle.net/11571/133009 doi:10.1016/j.palaeo.2005.06.022 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-28444456415 |
op_doi |
https://doi.org/10.1016/j.palaeo.2005.06.022 |
container_title |
Palaeogeography, Palaeoclimatology, Palaeoecology |
container_volume |
229 |
container_issue |
3 |
container_start_page |
187 |
op_container_end_page |
211 |
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